user32: Fix invalid argument passed to ExtCreateRegion.

[Sebastian Lackner]

The tests http://source.winehq.org/patches/data/107382 show that ExtCreateRegion is called with incorrect arguments at a lot of places in the wine source.
Please note that the variable 'size' doesn't include the header size. At one place the RECT count is passed instead of the size in bytes.

---
 dlls/user32/painting.c | 4 ++--
 dlls/user32/winpos.c   | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)
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